Correct Answer - Option 4 : 42
The logic followed here is -
(Elements in 1st and 3rd column in row 3) × 1.5 = Elements in 1st and 3rd column in row 1
12 × 1.5 = 18 ; 16 × 1.5 = 24
(Elements in 1st and 3rd column in row 4) × 1.5 = Elements in 1st and 3rd column in row 2
16 × 1.5 = 24 ; 18 × 1.5 = 27
(Element in 2nd column in row 4) × 0.5 = Element in 2nd column in row 2
22 × 0.5 = 11
Similarly,
(Element in 2nd column in row 3) × 0.5 = Element in 2nd column in row 1
? × 0.5 = 21
? = 21 / 0.5
? = 42.
Hence, the correct answer is "42".